php_admin_value open_basedir

i have setup the ISPConfig. Then i creat a lot of virtual host (domains) and one ssl-Domain for my Server, this domain called ssl.rr-netz.de. Then I will create subdir in this domain wich shows of other domains on the server, like
ssl.rr-netz.de/user1
ssl.rr-netz.de/user2
ssl.rr-netz.de/user3

so all users on the server can use a ssl domain, without everyone must buy a own ip & zertifikat. This works fine, but i have a problem with php_admin_value open_basedir

the Problem is that the ISPConfig always override my /etc/apache2/vhosts/Vhosts_ispconfig.conf and i have no chance to insert this entry into the Vhosts_ispconfig.conf.
Have anyone a idea for this problem?

ok, i have check this idea, but the problem is that for the domain ssl.rr-netz.de a host with port :80 and port :443 exist. This ok but when i insert
php_admin_value open_basedir /var/www/web15/:/var/www/web5/web/
into the Apache Direktiven (Optional): then in the vhost file the entry in both host replaced 80 & :443) but only the :443 host must be replaced.